Fixing device for installing pressure-type airbag sensor

ABSTRACT

The present invention provides a fixing device for installing a pressure-type air bag sensor, the fixing device comprising: a disc-shaped holder; a cover coupled to the holder and having a sensor part disposed on the top thereof; and a connector housing disposed on the bottom of the cover, wherein the holder has a holder body formed in a disc shape, an outer wall having a predetermined height is formed along the outer circumference of the holder body, a ring-shaped seal is formed through insert-injection molding to have a predetermined radius inside the holder body, and protrusion parts having a predetermined curvature are formed at the upper surface part and the lower surface part of the holder body.

TECHNICAL FIELD

The present invention relates to a fixing device for installing apressure-type airbag sensor.

DESCRIPTION OF RELATED ART

Side airbags are installed in vehicles to protect drivers.

In the event of a side impact of the vehicle, an output signal from aside impact sensor installed on a side surface of the vehicle is inputto an airbag control unit (ACU), and unfolding of the side airbag iscontrolled by the ACU.

In recent years, a pressure side impact sensor (PSIS) is mounted on aside portion of the vehicle to detect whether a side impact occurs.

The PSIS is mainly installed in a driver's door or a passenger's door.The PSIS serves to detect a pressure change generated inside a doormomentarily due to deformation of the door in the event of the sideimpact and transmit the detected pressure change to the ACU.

Since an AK-LV 29 standard PSIS is mounted while rotating using onehand, convenience of installation is enhanced through a structure of twohandles. This handle structure allows more moment to be transmittedduring the rotation. Further, since the PSIS should not be loosened dueto durability conditions or vibrations of the vehicle after the PSIS iscompletely installed, a loosening prevention part is provided.

In the PSIS according to the related art, a structure for assembling aplurality of components is complicated. For example, since structuressuch as a rotational direction fixing part that restricts movement in arotational direction and the loosening prevention part that preventsseparation between the components are additionally required, thestructure is complicated.

The related document related to the present invention is JP-08040185.

RELATED ART DOCUMENT Patent Document

(Patent Document 001) JP 08040185

SUMMARY OF THE DISCLOSURE

The present invention is directed to providing a fixing device forinstalling a pressure-type airbag sensor, in which a holder and a coverare prevented from being separated from each other, when the cover (400)passes through a section of the protrusion parts (140) and rotates to aset fastening position, one surface of the cover (400) is separated fromthe protrusion parts (140) and returns to its original position, and inthis case, the seal (140) is in elastic contact with the cover (400),and thus smooth sealing can be achieved at a position at which therotation is completed.

Further, the present invention is directed to also providing a fixingdevice for installing a pressure-type airbag sensor, in which aconnector housing (300) is covered through a prevention plate (152)before fastening between the holder (100) and the cover (400) iscompleted, and thus fastening of the connector housing (300) can beprevented from the outside.

The purposes of the present invention may be not limited to the purposesdescribed above, and other purposes and advantages of the presentinvention that are not described may be understood by the followingdescription and may be more clearly understood by embodiments of thepresent invention. Further, it may be easily identified that thepurposes and advantages of the present invention may be implemented byunits and combinations thereof described in the appended claims.

One aspect of the present invention provides a fixing device forinstalling a pressure-type airbag sensor.

The fixing device for installing a pressure-type airbag sensor includesa holder (100) having a disk shape, a cover (400) coupled to the holder(100) and having a sensor unit disposed at an upper end thereof, and aconnector housing (300) disposed at a lower end of the cover (400).

The holder (100) may have a holder body (110) formed in a disc shape.

An outer wall (120) having a predetermined height may be formed on anouter circumference of the holder body (110).

A seal having a ring shape may be insert-injected into the holder body(110) to have a predetermined radius

Protrusion parts (140) having a predetermined curvature are formed on anupper surface and a lower surface of the holder body (110).

The protrusion parts (140) may be formed to protrude in a pair from eachof the upper surface and the lower surface of the holder body (110).

The pair of protrusion parts (140) may be positioned to be symmetricalto each other with a central hole (111) formed at a center of the holderbody (110) as a boundary on each of the upper surface and the lowersurface of the holder body (140).

The pair of protrusion parts (140) formed on each of the upper surfaceand the lower surface of the holder body (110) may be arranged at thesame position.

Locking parts (180) protruding upward may be formed to protrude from aplurality of positions on the outer circumference of the holder body(110).

The plurality of locking parts (180) may be formed.

The locking parts (180) may be formed in a shape bent in an L shapetoward an inside of the holder body (110).

Each of the locking parts (180) may have a neck (181) extending from anouter wall thereof and a hook (182) bent inward from an upper end of theneck (181).

The plurality of locking parts (180) may be arranged at intervals of 60degrees.

Rotation locking parts (190) may be formed at a plurality of positionson the outer circumference of the holder body (110).

Each of the rotation locking parts (190) may be formed in a rectangularplate shape.

Each of the rotation locking parts (190) may be formed by being cut in arectangular shape from the outer circumference of the holder body (110).

A length of each of the rotation locking parts (190) may be formedlonger than a thickness of the holder body (110).

The rotation locking parts (190) may be positioned on side portions ofthe locking parts (180), respectively.

A thickness of each of the rotation locking parts (190) may graduallybecome thicker from one side to the other side.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view illustrating a state in which a fixingdevice for installing an airbag sensor according to the presentinvention is disposed on a panel.

FIG. 2 is perspective views illustrating the fixing device forinstalling an airbag sensor according to the present invention.

FIG. 3 is a perspective view illustrating a state in which a cover and aholder according to the present invention are coupled.

FIG. 4 is a perspective view illustrating a configuration of the holderaccording to the present invention.

FIG. 5A is a front view illustrating the holder according to the presentinvention.

FIG. 5B is a perspective view illustrating a bottom surface of theholder according to the present invention.

FIG. 6 is a perspective view illustrating a state in which the cover andthe holder according to the present invention are fastened.

FIG. 7 is a perspective view illustrating a bottom surface of the holderaccording to the present invention.

FIG. 8 are views illustrating a holder body in which a spring part isformed according to the present invention.

FIG. 9 is a perspective view illustrating a coupling relationshipbetween the spring part and a sensor unit according to the presentinvention.

FIG. 10 is a plan view illustrating the holder in which a locking partis formed according to the present invention.

FIG. 11A is an enlarged perspective view illustrating the locking partaccording to the present invention.

FIG. 11B is an enlarged perspective view illustrating a rotation lockingpart according to the present invention.

FIG. 12 is a perspective view illustrating a bottom surface of the coveraccording to the present invention.

FIG. 13 are perspective views illustrating the bottom surface of thecover according to the present invention.

FIG. 14 are views illustrating separation prevention grooves accordingto the present invention.

FIG. 15 is a bottom view illustrating the cover according to the presentinvention.

FIG. 16 is perspective view illustrating the cover according to thepresent invention.

FIG. 17 is a side view illustrating an arrangement state of the sensorunit formed in the cover according to the present invention.

FIG. 18 is perspective view illustrating the cover according to thepresent invention.

FIG. 19 is a perspective view illustrating a pressure inlet of FIG. 18 .

DETAILED DESCRIPTION OF EXEMPLARY IMPLEMENTATIONS

Hereinafter, provision or arrangement of an arbitrary component on an“upper portion (or a lower portion)” of a substrate or “on (or under)”the substrate means that the arbitrary component is provided or arrangedin contact with an upper surface (or a lower surface) of the substrate.

Further, the present invention is not limited to a state in whichanother component is not included between the substrate and thearbitrary component provided or arranged on (or under) the substrate.

Hereinafter, a fixing device for installing a pressure-type airbagsensor according to the present invention will be described withreference to the accompanying drawings.

The fixing device for installing a pressure-type airbag sensor accordingto the present invention includes a holder and a cover.

The holder according to the present invention will be described.

FIG. 1 is a perspective view illustrating a state in which a fixingdevice for installing a pressure-type airbag sensor according to thepresent invention is disposed on a panel, and FIG. 2 are perspectiveviews illustrating the fixing device for installing a pressure-typeairbag sensor according to the present invention.

The fixing device for installing a pressure-type airbag sensor accordingto the present invention is fixed to a panel 10.

The fixing device for installing a pressure-type airbag sensor has aholder 100 and a cover 400. A sensor unit 500 is disposed at an upperend of the cover 400, and a connector housing 300 is disposed at a lowerend of the cover 400.

FIG. 3 is a perspective view illustrating a state in which a cover and aholder according to the present invention are coupled, and FIG. 4 is aperspective view illustrating a configuration of the holder according tothe present invention.

Referring to FIGS. 3 and 4 , the holder 100 according to the presentinvention has a holder body 110 formed in a disc shape. An outer wall120 having a predetermined height is formed on an outer circumference ofthe holder body 110.

A seal 130 having a ring shape is insert-injected into the holder body110 to have a predetermined radius. The seal 130 protrudes from an uppersurface and a lower surface of the holder body 110 at a predeterminedlevel.

A central hole 111 having an entirely rectangular shape is cut andformed in a center of the holder body 110.

Further, protrusion parts 140 having a predetermined curvature areformed on the upper surface and the lower surface of the holder body 110according to the present invention.

Each of the protrusion parts 140 forms a predetermined curvature.

The protrusion parts 140 are formed to protrude from each of the uppersurface and the lower surface of the holder body 110 in a pair.

The pair of protrusion parts 140 are formed symmetric to each other withrespect to the central hole 111 as boundary on each of the upper surfaceand the lower surface of the holder body 140.

The pair of protrusion parts 140 formed on the upper surface and thelower surface of the holder body 110 are arranged at the same position.

A height of the protrusion parts 140 may be lower than a height of theseal 130.

Further, an outer circumferential length of the protrusion parts 140 maybe a quarter of the entire circumferential length connecting theprotrusion parts 140.

The holder body 110 according to the present invention is configured torotate, and the seals 130 arranged on both surfaces of the holder body110 form sealing due to contact with the cover 400 that is acounterpart.

In this case, while the cover 400 rotates, the cover 400 comes intophysical contact with a section in which the protrusion parts 140 areformed and thus rotates while lifted by the height of the protrusionparts 140. Accordingly, when the cover 400 rotates, while the seal 140is protected from the cover 400 that is a counterpart, the holder body110 may rotate.

Further, when the cover 400 passes through a section of the protrusionparts 140 and is rotated to a set fastening position, one surface of thecover 400 is separated from the protrusion parts 140 and returns to itsoriginal position. In this case, the seal 140 may be in elastic contactwith the cover 400 to achieve smooth sealing at a position at whichrotation is completed.

An upper end of the protrusion part 140 may be formed in a roundedshape.

FIG. 5A is a front view illustrating the holder according to the presentinvention, and FIG. 5B is a perspective view illustrating a bottomsurface of the holder according to the present invention.

Referring to FIGS. 5A and 5B, a connector insertion prevention part 150is formed on the outer circumference of the holder body 110 according tothe present invention.

The connector insertion prevention part 150 has a rib 151 having apredetermined length and a prevention plate 152 protruding outward froman end of the rib 151.

The rib 151 and the prevention plate 152 are formed integrally. Aposition of the prevention plate 152 changes while the holder body 110rotates.

The prevention plate 152 may be formed in the holder body 110 to bepositioned at a position covering the front side of the connectorhousing 300 in a position of the cover 400 before the rotation.

Further, when the holder body 110 is rotated to a position at which theholder body 110 is completely fastened to the cover 400, the preventionplate 152 is positioned on a lateral side of the connector housing 300.Accordingly, when the holder 100 and the cover 400 are completelyfastened, the connector housing 300 disposed on the upper surface of thecover 400 forms an open state.

That is, the connector housing 300 is covered through the preventionplate 152 before fastening between the holder 100 and the cover 400 iscompleted, and thus fastening of the connector housing 300 can beprevented from the outside.

Further, the prevention plate 152 is formed to have a rounded curvaturefrom one end to the other end. Therefore, as a slip is induced in theevent of an impact with another external structure, damage of the holder100 can be prevented.

FIG. 6 is a perspective view illustrating a state in which the cover andthe holder according to the present invention are fastened, and FIG. 7is a perspective view illustrating a bottom surface of the holderaccording to the present invention.

Referring to FIGS. 6 and 7 , first and second assembly guides 161 and162 are formed at an upper end of the holder body 110 according to thepresent invention.

The assembly guides 161 and 162 have a pair of first assembly guides 161protruding from the upper surface of the holder body 110 at both sidesof one end of the central hole.

The pair of first assembly guides 161 form a predetermined distancetherebetween. The pair of first assembly guides 161 may be caught byboth sides of an inner circumference of one end of a fastening hole 11formed in the panel 10.

The assembly guides 161 and 162 have a pair of second assembly guides162 protruding from the upper surface of the holder body 110 at bothsides of the other end of the central hole 111.

The pair of second assembly guides 162 are formed as plates having across section having a right triangle shape.

The pair of second assembly guides 162 form a predetermined distancetherebetween. The pair of assembly guides 162 are supported by bothsides of an inner circumference of the other end of the fastening hole11 formed in the panel 10.

In addition, rotation guides 163 having a predetermined curvature areformed on both sides of a central portion of the center hole 111 of theholder body 110 according to the present invention.

The rotation guides 163 may be configured as a pair of rotation guides163 while forming a semicircular shape. The pair of rotation guides 163are arranged to face each other.

The pair of rotation guides 163 are formed thicker than a thickness ofthe nearby holder body 110 and form a predetermined reinforcement force.

The pair of rotation guides 163 guide rotation of the sensor unit 500formed on the upper surface of the cover 400. A rotation guide member510 having a circular shape is formed at a central portion of the sensorunit 500.

Since rotation of the rotation guide member 510 is guided along an innercircumference of the pair of rotation guides 163 and the rotation guidemember 510 has a step having a predetermined thickness, the rotation ofthe rotation guide member 510 of the sensor unit 500 during the rotationcan be guided stably.

Although not illustrated in the drawings, a ring-shaped protrusion lineis formed on the inner circumference of the pair of rotation guides 163,the protrusion line rotates while fitted in a protrusion line grooveformed in an inner circumference of the rotation guide member 510, andthus more stable rotation can also be guided.

FIG. 8 are views illustrating a holder body in which a spring part isformed according to the present invention, and FIG. 9 is a perspectiveview illustrating a coupling relationship between the spring part and asensor unit according to the present invention.

Referring to FIGS. 8 and 9 , a catching step 511 is formed on an outercircumference of the rotation guide member 510 of the sensor unit 500according to the present invention.

Further, L-shaped cutout grooves 112 are formed on both sides of acentral portion of the central hole 111 formed in the holder body 110.

The spring parts 170 according to the present invention are formed inthe cutout grooves 112. Each of the spring parts 170 has a curvature rib171 having a curvature and a catching rib 172 extending from a distalend of the curvature rib 171 in a straight line.

The end of the curvature rib 171 is formed integrally with an innersurface of the cutout groove 112.

Accordingly, each of the spring parts 700 is formed in a free end shape.

In a state in which the cover 400 is coupled to the central hole 111, adistal end of the catching rib 172 of the spring part 170 is exposed tothe central hole 111 and thus may be caught by the catching step 511 ofthe rotation guide member 510 of the sensor unit 500.

Here, the catching step 511 is formed in an L shape, and an end of thecatching rib 172 is formed in a quadrangular shape.

Further, the catching rib 172 is caught by the upper surface of thecover 400. Accordingly, it is possible to prevent the cover 400 frombeing separated upward.

Further, each of the spring parts 710 includes the curvature rib 171 andthe catching rib 172 to form a predetermined length and thus haselasticity corresponding to the distance. Therefore, fastening sensebetween the holder 100 and the cover 400 can be improved, and assemblythereof can be secured.

In addition, the catching step 511 is formed in an L shape, and the endof the catching rib 172 caught thereby is formed in a quadrangularshape. Thus, the catching step 511 prevents the rotation before thecover 400 rotates and is completely fastened to the holder 100 andrestricts reverse rotation of the cover 100 after the assembly.

FIG. 10 is a plan view illustrating the holder in which a locking partis formed according to the present invention, and FIG. 11A is anenlarged perspective view illustrating the locking part according to thepresent invention.

Referring to FIGS. 10 and 11A, locking parts 180 protruding upward areformed to protrude from a plurality of positions on the outercircumference of the holder body 110 according to the present invention.

The plurality of locking parts 180 are formed. The locking part 180 isformed in a shape bent in an L shape toward an inner side of the holderbody 110.

The locking part 180 has a neck 181 extending from an outer wall thereofand a hook 182 bent inward from an upper end of the neck 181.

Further, the plurality of locking parts 180 may be arranged at intervalsof 60 degrees.

Therefore, when the cover 400 is rotated to a fastening position whilecoupled to the holder 100, ends of the locking parts 170 are caught byand fixed to an outer circumference of the lower end of the cover 400.Therefore, it is possible to prevent the cover 400 from being separatedfrom a lower portion of the holder 100.

Further, although not illustrated in the drawings, insertion groovesinto which the ends of the locking parts 180 are inserted may be furtherformed at a plurality of positions on the outer circumference of thelower end of the cover 400.

FIG. 11B is an enlarged perspective view illustrating a rotation lockingpart according to the present invention.

Referring to FIG. 11B, rotation locking parts 190 are formed at theplurality of positions on the outer circumference of the holder body 110according to the present invention.

Each of the rotation locking parts 190 is formed in a rectangular plateshape and is formed by being cut in a rectangular shape from the outercircumference of the holder body 110.

Further, a length of each of the rotation locking parts 190 is formedlonger than the thickness of the holder body 110.

The rotation locking parts 190 are positioned on side portions of eachof the locking parts 180.

In addition, the thickness of each of the rotation locking parts 190gradually becomes thicker from one side to the other side.

Therefore, when the cover 400 is rotated on an inner circumference ofthe holder body 110, one end of each of the rotation locking parts 190comes into contact with the outer circumference of the cover 400, thecover 400 is rotated to the fastening position, and thus the outercircumference of the cover 400 is gradually pressed into contact with athicker side thereof.

Therefore, the thickness of the rotation locking parts 190 may begradually increased in a fastening direction, and when the cover 400rotates, a rotational force may be gradually reduced. Further, afastening sound is generated at this fastening position so that anoperator can recognize the fastening.

Below, the cover according to the present invention will be described.

FIG. 12 is a perspective view illustrating a bottom surface of the coveraccording to the present invention.

Referring to FIG. 12 , the cover 400 according to the present inventionhas a cover body 410 formed in a disc shape.

A pair of first support portions 421 protruding upward are formed at oneend of one surface of the cover body 410. The pair of first supportportions 421 protrude upward. The pair of first support portions 421 areformed to face each other and have an L-shaped cross section.

A second support portions 422 protruding upward is formed at the otherend of one surface of the cover body 410.

Here, the connector housing 300 is disposed in a space between the pairof first support portions 421 and the second support portion 422.

Both sides of one end of the connector housing 300 are supported by thepair of first support portions 421, and the other end of the connectorhousing 300 is supported by the second support portion 422.

Further, the pair of first support portions 421 and the second supportportion 422 protrude upward along the connector housing 300.

Accordingly, the pair of first support portions 421 and the secondsupport portion 422 according to the present invention may serve as ahand tool that may be held by the operator when the cover 100 isinstalled in the panel 10.

Further, corners of the pair of first support portions 421 and thesecond support portion 422 are formed in a rounded shape, so that theoperator can be protected and damage caused by a collision with anobject can be prevented.

Further, the pair of first support portions 421 and the second supportportion 422 may perform guiding when the connector housing 300 isassembled.

Further, when the cover 400 is installed in the panel 10, the pair offirst support portions 421 and the second support portion 422 canprevent the connector housing 300 from being caught by the panel 10.

FIG. 13 are perspective views illustrating the bottom surface of thecover according to the present invention, and FIG. 14 are viewsillustrating separation prevention grooves according to the presentinvention.

Referring to FIGS. 13 and 14 , a seating part 430 in which an innerspace is formed and a corner is formed in a wall body is formed betweenthe pair of first support portions 421 and the second support portion422 according to the present invention.

The connector housing 300 is seated on the inner space of the seatingpart 430.

Here, cutout grooves 431 and 432 are formed at one end and the other endof the seating part 430.

Further, a second insertion groove 422 a is formed in the second supportportion 422, and the second insertion groove 422 a is connected to thecutout groove 431 formed at the other end of the seating part 430.

Further, a first insertion groove 421 a is formed between the pair offirst support portions 421, and the first insertion groove 421 a isconnected to the cutout groove 432 formed at the one end of the seatingpart.

Here, the first and second insertion grooves 421 a and 422 a are coupledas fitting structures formed at both ends of the connector housing 300are fitted in the first and second insertion grooves 421 a and 422 a.Therefore, the first and second insertion grooves 421 a and 422 a canguide the coupling of the connector housing 300 and prevent separationof the connector housing 300.

Further, inclined surfaces S inclined inward are formed in entrances ofthe first and second insertion grooves 421 a and 422 a. The inclinedsurfaces S serve to guide the fitting structures of the connectorhousing 300 such that the fitting structures are inserted.

FIG. 15 is a bottom view illustrating the cover according to the presentinvention.

Referring to FIG. 15 , reverse rotation prevention protrusions 441protruding outward are formed at intervals at a plurality of positionsof an outer circumference of the cover body 410 according to the presentinvention. The reverse rotation prevention protrusions 441 are formed ina quadrangular shape.

Further, rotation guide protrusions 442 protrude from the plurality ofpositions of the cover body 410. The rotation guide protrusions 422 maybe formed in a quadrangular shape, and corners thereof have apredetermined curvature.

Further, the rotation guide protrusion 442 is formed to correspond tothe number of rotation locking parts 190 formed on the outer wall of theholder body 110.

Accordingly, when the holder body 110 and the cover body 410 are coupledand the cover body 410 rotates in an arrow direction, the rotation guideprotrusions 442 move along a surface of which the thickness increasesfrom one end to the other end of the rotation locking parts 190, and therotation guide protrusions 442 pass through the rotation locking parts190 at distal ends. In this case, a fastening sound may be generatedwhile the rotation guide protrusions 442 are separated from the distalends of the rotation locking parts 190.

Further, the reverse rotation prevention protrusions 441 are caught bythe other ends of the rotation locking parts 190 having a relativelylarge thickness, so that the cover body 410 according to the presentinvention can be prevented from being reversely rotated in a directionopposite to the arrow direction.

FIG. 16 is perspective view illustrating the cover according to thepresent invention.

Referring to FIG. 16 , auxiliary protrusion parts 450 are formed at twopositions on an upper surface of the cover body 410 according to thepresent invention. The auxiliary protrusion parts 450 may be formed as apair or more of auxiliary protrusion parts 450.

The auxiliary protrusion parts 450 may have substantially the sameheight as the protrusion parts 140 formed in the holder body 110.

The seals 140 arranged on both sides of the holder body 110 in thepresent invention form sealing due to contact with a counterpart.

In this case, while the cover body 410 rotates, the cover body 400 comesinto physical contact with a section in which the auxiliary protrusionparts 450 are formed and thus rotates while lifted by the height of theauxiliary protrusion parts 450. Accordingly, when the cover body 410rotates, the cover body 410 may rotate relative to the holder body 110while protecting the seal 130.

Further, when the holder body 110 passes through a section of theprotrusion parts 140 and is rotated to a fastening position, one surfaceof the holder body 110 that is a counterpart is separated from theauxiliary protrusion parts 450 and returns to its original position. Inthis case, the seal 130 may be in elastic contact with the upper surfaceof the cover body 410 to achieve smooth sealing at a position at whichthe rotation is completed, and thus fastening sense can be improved, anda rotational force can be reduced during the rotation.

Here, an upper surface of each of the auxiliary protrusion parts 450 mayalso be formed in a convex curvature.

FIG. 17 is a side view illustrating an arrangement state of the sensorunit formed in the cover according to the present invention.

Referring to FIG. 17 , the sensor unit 500 is formed at a center of anupper end of the cover body 410 according to the present invention.

The sensor unit 500 has a connection body 520 formed at a center of thecover body 410, a pressure inlet body 530 in which a pressure inlet 531extending to one side of the connection body 520 is formed, and anextension body 540 extending to the other side of the connection body520.

Here, blades B are formed on both side surfaces of the pressure inletbody 530 and the extension body 540.

Each of the blades B forms a predetermined inclination rising along anupper side from the center of the cover body 410. The inclinations ofthe blades B are identical to each other (a1=a2). Therefore, the coverbody 410 may advantageously be installed in panels having differentthicknesses according to an inclination angle.

Further, the blades B according to the present invention are formed toprotrude at regular intervals from the assembly guides formed on theholder body 110. Therefore, when the cover body 410 is installed in thepanel 10, the blades B of the sensor unit 500 may be arranged to passthrough the panel 10 and to be caught by an upper surface of the panel10.

FIG. 18 is perspective view illustrating the cover according to thepresent invention, and FIG. 19 is a perspective view illustrating apressure inlet of FIG. 18 .

Referring to FIGS. 18 and 19 , in the pressure inlet body 530 accordingto the present invention, the pressure inlet 531 is formed.

A layered partition member 532 is formed inside the pressure inlet 531.The partition member 532 is positioned inside an input end of thepressure inlet 531.

Therefore, foreign substances may be filtered out by the partitionmember 532 formed in the pressure inlet 531.

According to the configuration and operation described above, in thepresent invention, the holder and the cover are prevented from beingseparated from each other, and when the cover 400 passes through asection of the protrusion parts 140 and rotates to a set fasteningposition, one surface of the cover 400 is separated from the protrusionparts 140 and returns to its original position. In this case, the seal140 is in elastic contact with the cover 400, and thus smooth sealingcan be achieved at a position at which the rotation is completed.

Further, in the present invention, the connector housing 300 is coveredthrough the prevention plate 152 before fastening between the holder 100and the cover 400 is completed, and thus fastening of the connectorhousing 300 can be prevented from the outside.

In the present invention, a holder and a cover are prevented from beingseparated from each other, and when the cover (400) passes through asection of the protrusion parts (140) and rotates to a set fasteningposition, one surface of the cover (400) is separated from theprotrusion parts (140) and returns to its original position. In thiscase, the seal (140) is in elastic contact with the cover (400), andthus smooth sealing can be achieved at a position at which the rotationis completed.

Further, in the present invention, the connector housing (300) iscovered through the prevention plate (152) before fastening between theholder (100) and the cover (400) is completed, and thus fastening of theconnector housing (300) can be prevented from the outside.

Detailed descriptions of the present invention have been describedabove, but it is obvious that various modifications may be made withoutdeparting from the scope of the present invention.

Therefore, the scope of the present invention is not limited to thedescribed embodiments and should be defined by equivalents of theappended claims as well as the scope of the appended claims.

That is, it should be understood that the above-described embodimentsare illustrative in all aspects and not restrictive, the scope of thepresent invention is indicated by the appended claims described belowrather than the detailed description, and it should be construed thatthe meaning and scope of the appended claims and all changes andmodifications derived from equivalent concepts thereof are included inthe scope of the present invention.

1. A fixing device for installing a pressure-type airbag sensor, thefixing device comprising: a holder having a disk shape; a cover coupledto the holder and having a sensor unit disposed at an upper end thereof;and a connector housing disposed at a lower end of the cover, whereinthe holder has a holder body formed in a disc shape, an outer wallhaving a predetermined height is formed on an outer circumference of theholder body, a seal having a ring shape is insert-injected into theholder body to have a predetermined radius, and protrusion parts havinga predetermined curvature are formed on an upper surface and a lowersurface of the holder body.
 2. The fixing device of claim 1, wherein theprotrusion parts are formed to protrude in a pair from each of the uppersurface and the lower surface of the holder body, the pair of protrusionparts are positioned to be symmetrical to each other with a central holeformed at a center of the holder body as a boundary on each of the uppersurface and the lower surface of the holder body, and the pair ofprotrusion parts formed on each of the upper surface and the lowersurface of the holder body are arranged at the same position.
 3. Thefixing device of claim 2, wherein locking parts protruding upward areformed to protrude from a plurality of positions on the outercircumference of the holder body, the plurality of locking parts areformed, the locking parts are formed in a shape bent in an L shapetoward an inside of the holder body, each of the locking parts has aneck extending from an outer wall thereof and a hook bent inward from anupper end of the neck, and the plurality of locking parts are arrangedat intervals of 60 degrees.
 4. The fixing device of claim 3, whereinrotation locking parts are formed at a plurality of positions on theouter circumference of the holder body, each of the rotation lockingparts is formed in a rectangular plate shape and is formed by being cutin a rectangular shape from the outer circumference of the holder body,a length of each of the rotation locking parts is formed longer than athickness of the holder body, and the rotation locking parts arepositioned on side portions of the locking parts, respectively.
 5. Thefixing device of claim 4, wherein a thickness of each of the rotationlocking parts gradually becomes thicker from one side to the other side.